Static Reactive Power Generator (SVG) Research And Application

With modern power electronic devices are widely applied, resulting in deterioration of power quality, mainly in the power grid voltage fluctuations and flicker, the rapid changes in reactive power, harmonic current and voltage. To alleviate the burden of power, usually means reactive power compensation device to compensate for the reactive power demand, the most advanced reactive power compensation equipment is SVG, SVG therefore of great significance to study.On a single SVG, in the main circuit, the PWM rectifier based on the main circuit topology of the SVG, the role of the LCL, its work can be done to reduce harmonic generation; in the control strategy, the proposed fuzzy PI control and space combination of control vector control methods; overall a dual closed loop control, ie, reactive current inner loop and outer voltage rectifier DC side, inside and outside the ring are the fuzzy PI control can be carried out online parameter tuning. Control method is verified by simulation the feasibility and superiority.In the realization of large capacity and diversity of compensation, this paper gives a modular stand-alone SVG parallel to achieve bigger capacity and to achieve an integrated parallel compensation compensation diversity. For stand-alone SVG modules in parallel to achieve high-capacity method was given based on the parallel distribution of reactive power control; control strategy based on the limited capacity of parallel control; based on a set of parallel-connected transformer without control. Compensation method for parallel synthesis, given its compensation performance, loss of detailed analysis and comprehensive compensation method is given control of some of the principles should be adhered to.Using the proposed scheme demonstrated in the oil rig (SCR) power drive system for the application, the generator excitation controller integrated in parallel with SVG form of compensation device. Its hardware design, software design. Comparing the measured waveform are given to verify the advantages of the method described in this article.